SCCA® Solo classing — unofficial guide
What autocross class is a Honda Civic Si (10th gen)?
A stock 2017–2020 Honda Civic Si (10th gen) runs in GS (Street) under the 2026 SCCA Solo Rules. Built to Street Touring allowances (within GST tire and wheel limits), it runs GST.
Class by preparation level
| Stock (Street) | GS |
| Street Touring | GST |
| Street Prepared | ESP |
| Street Modified | SMF |
| Prepared | — |
A “—” means the car isn’t listed at that level; a build lands in the least-prepared category its modifications allow.
Also eligible for
From the 2026 rulebook (Appendix A)
Street: 'Civic Si (2017-20)' = GS (11th gen 2022-26 also GS). ST: 'Civic Si (2017-26)' = GST; 2002-15 Si = DST. SP: 'Civic Si (2017-21)' = ESP (10th-gen 2017-20; the 11th-gen 2022-26 is not ESP-listed).
Other GS cars
Unofficial guidance verified against the 2026 SCCA® Solo® Rules — always confirm against the current rulebook before competing. Classing data cites the exact Appendix A wording it relies on. Spot an error? Report it on GitHub.